MFC 之 CButton 控件重绘（GDI篇）

http://blog.csdn.net/yuzhenxiong0823/article/details/23278763

最近在为公司用MFC做产品界面。因为是小公司，所以也没有现成的界面库，必须自己一点一点写。自己在网上收集了点资料，就写了几个类型的button类，以供以后使用。

目前为止，做了三种类型的按钮,分别是：

1.一般情况使用的，比较常用的button类CNormalBtn;

2.特殊一点的，类似拥有菜单功能的button类CMenuBtn(和CNormal的区别是按钮selected后的状态不会随着鼠标的离开而消失);

3.静态按钮，用来呈现log等图片之类的button类CStatic,该类不会响应鼠标事件。

对于1,2种按钮，用的图片模式是：（png格式，一幅图里有四副小图，依次表示NoFoucs,Mousemove, buttondown, Disable四种状态）；

对于3类按钮，用的图片模式是：（png格式）

下面贴代码：

基类代码（BaseBtn.h）

[cpp] view plain copy print ?

#ifndef__BASEBTN_H__
#define__BASEBTN_H__
#include"stdafx.h"
#include<atlimage.h>
#if_MSC_VER>1000
#pragmaonce
#endif
classCBaseBtn:publicCButton
{
public:
CBaseBtn();
~CBaseBtn();
public:
virtualBOOLCreate(LPCTSTRlpszClassName,LPCTSTRlpszWindowName,DWORDdwStyle,constRECT&rect,CWnd*pParentWnd,UINTnID,CCreateContext*pContext=NULL);
virtualvoidDrawItem(LPDRAWITEMSTRUCTlpDrawItemStruct);
virtualvoidSetFont(CFont*pFont,BOOLbRedraw=TRUE);
virtualvoidSetWindowText(LPCTSTRlpszString);
public:
voidInit(UINTuImageID);
voidSetBtnTextColor(COLORREFclr);
protected:
afx_msgBOOLOnEraseBkgnd(CDC*pDC);
DECLARE_MESSAGE_MAP()
protected:
intm_nCtrlState;
CImagem_Image;
intm_nSrcWidth;
intm_nSrcHeight;
private:
CStringm_strBtnText;
CFont*m_pFont;
COLORREFm_clr;
};
#endif

#ifndef __BASEBTN_H__
#define __BASEBTN_H__

#include "stdafx.h"
#include <atlimage.h>

#if _MSC_VER > 1000
#pragma once
#endif

class CBaseBtn : public CButton
{
public:
 CBaseBtn();
 ~CBaseBtn();

public:
 virtual BOOL Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext = NULL);
 virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
 virtual void SetFont(CFont* pFont, BOOL bRedraw = TRUE);
 virtual void SetWindowText(LPCTSTR lpszString);
 
public:
 void Init(UINT uImageID);
 void SetBtnTextColor(COLORREF clr);
  
protected:
 afx_msg BOOL OnEraseBkgnd(CDC* pDC);

 DECLARE_MESSAGE_MAP()

protected:
 int   m_nCtrlState;

 CImage  m_Image;
 int   m_nSrcWidth;
 int   m_nSrcHeight;

private:
 CString  m_strBtnText;
 CFont*  m_pFont;
 COLORREF m_clr;
};

#endif

基类代码（BaseBtn.cpp）

[cpp] view plain copy print ?

#include"stdafx.h"
#include"BaseBtn.h"
#include"Public.h"
#ifdef_DEBUG
#definenewDEBUG_NEW
#undefTHIS_FILE
staticcharTHIS_FILE[]=__FILE__;
#endif
CBaseBtn::CBaseBtn()
{
m_pFont=newCFont;
VERIFY(m_pFont->CreateFont(15,0,0,0,FW_BOLD,FALSE,FALSE,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH|FF_SWISS,_T("Tahoma")));
m_strBtnText=L"";
m_clr=RGB(0,0,0);
}
CBaseBtn::~CBaseBtn()
{
if(!m_Image.IsNull())
m_Image.Destroy();
if(m_pFont!=NULL)
{
m_pFont->DeleteObject();
deletem_pFont;
m_pFont=NULL;
}
}
BEGIN_MESSAGE_MAP(CBaseBtn,CButton)
ON_WM_ERASEBKGND()
END_MESSAGE_MAP()
voidCBaseBtn::Init(UINTuImageID)
{
SetButtonStyle(BS_OWNERDRAW);
LoadPicture(m_Image,uImageID);
m_nSrcWidth=m_Image.GetWidth();
m_nSrcHeight=m_Image.GetHeight();
SetWindowPos(NULL,0,0,m_nSrcWidth/4,m_nSrcHeight,SWP_NOMOVE|SWP_NOACTIVATE);
if(IsWindowEnabled())
m_nCtrlState=CTRL_NOFOCUS;
else
m_nCtrlState=CTRL_DISABLE;
}
voidCBaseBtn::SetFont(CFont*pFont,BOOLbRedraw)
{
m_pFont=pFont;
if(bRedraw)
Invalidate();
}
voidCBaseBtn::SetWindowText(LPCTSTRlpszString)
{
m_strBtnText=lpszString;
Invalidate();
}
voidCBaseBtn::SetBtnTextColor(COLORREFclr)
{
m_clr=clr;
Invalidate();
}
BOOLCBaseBtn::Create(LPCTSTRlpszClassName,LPCTSTRlpszWindowName,DWORDdwStyle,constRECT&rect,CWnd*pParentWnd,UINTnID,CCreateContext*pContext)
{
returnCWnd::Create(lpszClassName,lpszWindowName,dwStyle,rect,pParentWnd,nID,pContext);
}
voidCBaseBtn::DrawItem(LPDRAWITEMSTRUCTlpDrawItemStruct)
{
if(m_Image.IsNull())
return;
CRectbuttonRect;
GetClientRect(buttonRect);
CDC*pDC=CDC::FromHandle(lpDrawItemStruct->hDC);//按钮控件DC
CDCdcMem;
dcMem.CreateCompatibleDC(pDC);
CBitmapmemBitmap;
memBitmap.CreateCompatibleBitmap(pDC,buttonRect.Width(),buttonRect.Height());
dcMem.SelectObject(memBitmap);
dcMem.FillSolidRect(buttonRect,RGB(255,0,255));//设置画布颜色
CRectrcSrc=CRect(0,0,0,0);
switch(m_nCtrlState)
{
caseCTRL_NOFOCUS:
{
rcSrc=CRect(0,0,m_nSrcWidth/4,m_nSrcHeight);
}
break;
caseCTRL_FOCUS:
{
rcSrc=CRect(m_nSrcWidth/4,0,m_nSrcWidth/4*2,m_nSrcHeight);
}
break;
caseCTRL_SELECTED:
{
rcSrc=CRect(m_nSrcWidth/4*2,0,m_nSrcWidth/4*3,m_nSrcHeight);
}
break;
caseCTRL_DISABLE:
{
rcSrc=CRect(m_nSrcWidth/4*3,0,m_nSrcWidth,m_nSrcHeight);
}
break;
default:
break;
}
m_Image.Draw(dcMem.m_hDC,buttonRect,rcSrc);
dcMem.SetBkMode(TRANSPARENT);
dcMem.SetTextColor(m_clr);
CFont*pOldFont=dcMem.SelectObject(m_pFont);
DrawText(dcMem.m_hDC,m_strBtnText,-1,buttonRect,DT_CENTER|DT_SINGLELINE|DT_VCENTER);
dcMem.SelectObject(pOldFont);
pDC->BitBlt(0,0,buttonRect.Width(),buttonRect.Height(),&dcMem,0,0,SRCCOPY);
memBitmap.DeleteObject();
}
BOOLCBaseBtn::OnEraseBkgnd(CDC*pDC)
{
returnTRUE;
}

#include "stdafx.h"
#include "BaseBtn.h"
#include "Public.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

CBaseBtn::CBaseBtn()
{
 m_pFont = new CFont;
 VERIFY(m_pFont->CreateFont(15, 0, 0, 0, FW_BOLD, FALSE, FALSE, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, 
  CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, _T("Tahoma")));

 m_strBtnText = L"";
 m_clr = RGB(0, 0, 0);
}

CBaseBtn::~CBaseBtn()
{
 if (!m_Image.IsNull())
  m_Image.Destroy();

 if (m_pFont != NULL)
 {
  m_pFont->DeleteObject();

  delete m_pFont;
  m_pFont = NULL;
 }
}

BEGIN_MESSAGE_MAP(CBaseBtn, CButton)
 ON_WM_ERASEBKGND()
END_MESSAGE_MAP()

void CBaseBtn::Init(UINT uImageID)
{
 SetButtonStyle(BS_OWNERDRAW);

 LoadPicture(m_Image, uImageID);
 m_nSrcWidth = m_Image.GetWidth();
 m_nSrcHeight = m_Image.GetHeight();

 SetWindowPos(NULL, 0, 0, m_nSrcWidth/4, m_nSrcHeight, SWP_NOMOVE|SWP_NOACTIVATE);

 if (IsWindowEnabled())
  m_nCtrlState = CTRL_NOFOCUS;
 else
  m_nCtrlState = CTRL_DISABLE;
}

void CBaseBtn::SetFont(CFont* pFont, BOOL bRedraw)
{
 m_pFont = pFont;

 if(bRedraw)
  Invalidate();
}

void CBaseBtn::SetWindowText(LPCTSTR lpszString)
{
 m_strBtnText = lpszString;
 Invalidate();
}

void CBaseBtn::SetBtnTextColor(COLORREF clr)
{
 m_clr = clr;
 Invalidate();
}

BOOL CBaseBtn::Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext) 
{
 return CWnd::Create(lpszClassName, lpszWindowName, dwStyle, rect, pParentWnd, nID, pContext);
}

void CBaseBtn::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 
{
 if (m_Image.IsNull())
  return ;

 CRect buttonRect;
 GetClientRect(buttonRect);

 CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);  //按钮控件DC

 CDC dcMem;
 dcMem.CreateCompatibleDC(pDC);

 CBitmap memBitmap;
 memBitmap.CreateCompatibleBitmap(pDC, buttonRect.Width(), buttonRect.Height());
 dcMem.SelectObject(memBitmap);

 dcMem.FillSolidRect(buttonRect, RGB(255,0,255)); //设置画布颜色

 CRect rcSrc = CRect(0,0,0,0);
 switch(m_nCtrlState)
 {
 case CTRL_NOFOCUS:
  {
   rcSrc = CRect(0, 0, m_nSrcWidth/4, m_nSrcHeight);  
  }
  break;

 case CTRL_FOCUS:
  {
   rcSrc = CRect(m_nSrcWidth/4, 0, m_nSrcWidth/4 * 2, m_nSrcHeight);
  }
  break;
 case CTRL_SELECTED:
  {
   rcSrc = CRect(m_nSrcWidth/4 * 2, 0, m_nSrcWidth/4 * 3, m_nSrcHeight);
  }
  break;

 case CTRL_DISABLE:
  {
   rcSrc = CRect(m_nSrcWidth/4 * 3, 0, m_nSrcWidth, m_nSrcHeight);
  }
  break;

 default:
  break;
 }
 m_Image.Draw(dcMem.m_hDC, buttonRect, rcSrc);

 dcMem.SetBkMode(TRANSPARENT);
 dcMem.SetTextColor(m_clr);
 CFont* pOldFont = dcMem.SelectObject(m_pFont);
 DrawText(dcMem.m_hDC, m_strBtnText, -1, buttonRect, DT_CENTER|DT_SINGLELINE|DT_VCENTER);
 dcMem.SelectObject(pOldFont);

 pDC->BitBlt(0, 0, buttonRect.Width(), buttonRect.Height(), &dcMem, 0, 0, SRCCOPY);
 memBitmap.DeleteObject();
}

BOOL CBaseBtn::OnEraseBkgnd(CDC* pDC)
{
 return TRUE;
}

第一类button(NormalBtn.h)

[cpp] view plain copy print ?

#ifndef__NORMALBTN_H__
#define__NORMALBTN_H__
#include"BaseBtn.h"
classCNormalBtn:publicCBaseBtn
{
public:
CNormalBtn();
~CNormalBtn();
protected:
afx_msgvoidOnMouseMove(UINTnFlags,CPointpoint);
afx_msgvoidOnLButtonDown(UINTnFlags,CPointpoint);
afx_msgvoidOnLButtonUp(UINTnFlags,CPointpoint);
afx_msgLRESULTOnMouseLeave(WPARAM,LPARAM);
afx_msgLRESULTOnMouseHover(WPARAM,LPARAM);
DECLARE_MESSAGE_MAP()
private:
BOOLm_bTracking;//捕获设置标记
};
#endif

#ifndef __NORMALBTN_H__
#define __NORMALBTN_H__

#include "BaseBtn.h"

class CNormalBtn : public CBaseBtn
{
public:
 CNormalBtn();
 ~CNormalBtn();

protected:
 afx_msg void OnMouseMove(UINT nFlags, CPoint point);
 afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
 afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
 afx_msg LRESULT OnMouseLeave(WPARAM, LPARAM);       
 afx_msg LRESULT OnMouseHover(WPARAM, LPARAM);

 DECLARE_MESSAGE_MAP()

private:
 BOOL   m_bTracking;      // 捕获设置标记
 
};

#endif

第一类button(NormalBtn. cpp)

[cpp] view plain copy print ?

#include"stdafx.h"
#include"NormalBtn.h"
#include"Public.h"
#ifdef_DEBUG
#definenewDEBUG_NEW
#undefTHIS_FILE
staticcharTHIS_FILE[]=__FILE__;
#endif
CNormalBtn::CNormalBtn()
:m_bTracking(FALSE)
{
}
CNormalBtn::~CNormalBtn()
{
}
BEGIN_MESSAGE_MAP(CNormalBtn,CBaseBtn)
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONDOWN()
ON_WM_LBUTTONUP()
ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)
ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)
END_MESSAGE_MAP()
voidCNormalBtn::OnMouseMove(UINTnFlags,CPointpoint)
{
if(!m_bTracking)
{
TRACKMOUSEEVENTtme;
tme.cbSize=sizeof(tme);
tme.hwndTrack=m_hWnd;
tme.dwFlags=TME_LEAVE|TME_HOVER;
tme.dwHoverTime=1;
m_bTracking=_TrackMouseEvent(&tme);
}
CBaseBtn::OnMouseMove(nFlags,point);
}
LRESULTCNormalBtn::OnMouseHover(WPARAMwParam,LPARAMlParam)
{
if(m_nCtrlState==CTRL_NOFOCUS)
{
m_nCtrlState=CTRL_FOCUS;
Invalidate();
}
m_bTracking=FALSE;
return0;
}
LRESULTCNormalBtn::OnMouseLeave(WPARAMwParam,LPARAMlParam)
{
if(m_nCtrlState!=CTRL_NOFOCUS)
{
m_nCtrlState=CTRL_NOFOCUS;
Invalidate();
}
m_bTracking=FALSE;
return0;
}
voidCNormalBtn::OnLButtonDown(UINTnFlags,CPointpoint)
{
if(m_nCtrlState==CTRL_FOCUS)
{
m_nCtrlState=CTRL_SELECTED;
Invalidate();
}
CBaseBtn::OnLButtonDown(nFlags,point);
}
voidCNormalBtn::OnLButtonUp(UINTnFlags,CPointpoint)
{
if(m_nCtrlState==CTRL_SELECTED)
{
m_nCtrlState=CTRL_FOCUS;
Invalidate();
}
CBaseBtn::OnLButtonUp(nFlags,point);
}

#include "stdafx.h"
#include "NormalBtn.h"
#include "Public.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

CNormalBtn::CNormalBtn()
 :m_bTracking(FALSE)
{

}

CNormalBtn::~CNormalBtn()
{

}

BEGIN_MESSAGE_MAP(CNormalBtn, CBaseBtn)
 ON_WM_MOUSEMOVE()
 ON_WM_LBUTTONDOWN()
 ON_WM_LBUTTONUP()
 ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)       
 ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)
END_MESSAGE_MAP()

void CNormalBtn::OnMouseMove(UINT nFlags, CPoint point) 
{
 if (!m_bTracking)  
 {   
  TRACKMOUSEEVENT tme;  
  tme.cbSize = sizeof(tme);  
  tme.hwndTrack = m_hWnd;  
  tme.dwFlags = TME_LEAVE|TME_HOVER;  
  tme.dwHoverTime = 1;  
  m_bTracking = _TrackMouseEvent(&tme);  
 }  

 CBaseBtn::OnMouseMove(nFlags, point);
}
LRESULT CNormalBtn::OnMouseHover(WPARAM wParam,LPARAM lParam)
{
 if (m_nCtrlState == CTRL_NOFOCUS)
 {
  m_nCtrlState = CTRL_FOCUS;
  Invalidate();
 }

 m_bTracking = FALSE;
 return 0;
}

LRESULT CNormalBtn::OnMouseLeave(WPARAM wParam,LPARAM   lParam)       
{   
 if(m_nCtrlState != CTRL_NOFOCUS)
 {
  m_nCtrlState = CTRL_NOFOCUS;
  Invalidate();
 }

 m_bTracking = FALSE; 
 return 0;       
}       

void CNormalBtn::OnLButtonDown(UINT nFlags, CPoint point) 
{
 if(m_nCtrlState == CTRL_FOCUS)
 {
  m_nCtrlState = CTRL_SELECTED;
  Invalidate();
 }

 CBaseBtn::OnLButtonDown(nFlags, point);
}

void CNormalBtn::OnLButtonUp(UINT nFlags, CPoint point)
{
 if(m_nCtrlState == CTRL_SELECTED)
 {
  m_nCtrlState = CTRL_FOCUS;
  Invalidate();
 }
 CBaseBtn::OnLButtonUp(nFlags, point);
}

第二类按钮（CMenu.h）

[cpp] view plain copy print ?

#ifndef__MENUBTN_H__
#define__MENUBTN_H__
#include"BaseBtn.h"
classCMenuBtn:publicCBaseBtn
{
public:
CMenuBtn();
~CMenuBtn();
public:
BOOLGetMenuOn(){returnm_bMenuOn;}
voidSetMenuOn(BOOLbMenuOn);
protected:
afx_msgvoidOnMouseMove(UINTnFlags,CPointpoint);
afx_msgvoidOnLButtonDown(UINTnFlags,CPointpoint);
afx_msgLRESULTOnMouseLeave(WPARAM,LPARAM);
afx_msgLRESULTOnMouseHover(WPARAM,LPARAM);
DECLARE_MESSAGE_MAP()
private:
BOOLm_bTracking;//捕获设置标记
BOOLm_bMenuOn;//该菜单按钮是否被选中
};
#endif

#ifndef __MENUBTN_H__
#define __MENUBTN_H__

#include "BaseBtn.h"

class CMenuBtn : public CBaseBtn
{
public:
 CMenuBtn();
 ~CMenuBtn();

public:
 BOOL GetMenuOn() { return m_bMenuOn; }
 void SetMenuOn(BOOL bMenuOn);

protected:
 afx_msg void OnMouseMove(UINT nFlags, CPoint point);
 afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
 afx_msg LRESULT OnMouseLeave(WPARAM, LPARAM);       
 afx_msg LRESULT OnMouseHover(WPARAM, LPARAM);

 DECLARE_MESSAGE_MAP()

private:
 BOOL   m_bTracking;      // 捕获设置标记
 BOOL   m_bMenuOn;      // 该菜单按钮是否被选中

};

#endif

第二类按钮（CButton.cpp）

[cpp] view plain copy print ?

#include"stdafx.h"
#include"MenuBtn.h"
#include"Public.h"
#ifdef_DEBUG
#definenewDEBUG_NEW
#undefTHIS_FILE
staticcharTHIS_FILE[]=__FILE__;
#endif
CMenuBtn::CMenuBtn()
:m_bTracking(FALSE)
,m_bMenuOn(FALSE)
{
}
CMenuBtn::~CMenuBtn()
{
}
BEGIN_MESSAGE_MAP(CMenuBtn,CBaseBtn)
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONDOWN()
ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)
ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)
END_MESSAGE_MAP()
voidCMenuBtn::OnMouseMove(UINTnFlags,CPointpoint)
{
if(!m_bTracking)
{
TRACKMOUSEEVENTtme;
tme.cbSize=sizeof(tme);
tme.hwndTrack=m_hWnd;
tme.dwFlags=TME_LEAVE|TME_HOVER;
tme.dwHoverTime=1;
m_bTracking=_TrackMouseEvent(&tme);
}
CButton::OnMouseMove(nFlags,point);
}
voidCMenuBtn::OnLButtonDown(UINTnFlags,CPointpoint)
{
if(m_nCtrlState!=CTRL_SELECTED)
{
m_nCtrlState=CTRL_SELECTED;
m_bMenuOn=TRUE;
Invalidate();
}
CButton::OnLButtonDown(nFlags,point);
}
LRESULTCMenuBtn::OnMouseLeave(WPARAMwParam,LPARAMlParam)
{
if(m_bMenuOn)
{
m_nCtrlState=CTRL_SELECTED;
Invalidate();
}
else
{
m_nCtrlState=CTRL_NOFOCUS;
Invalidate();
}
m_bTracking=FALSE;
return0;
}
LRESULTCMenuBtn::OnMouseHover(WPARAMwParam,LPARAMlParam)
{
if(m_nCtrlState!=CTRL_FOCUS)
{
m_nCtrlState=CTRL_FOCUS;
Invalidate();
}
m_bTracking=FALSE;
return0;
}
voidCMenuBtn::SetMenuOn(BOOLbMenuOn)
{
m_bMenuOn=bMenuOn;
Invalidate();
}

#include "stdafx.h"
#include "MenuBtn.h"
#include "Public.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

CMenuBtn::CMenuBtn()
:m_bTracking(FALSE)
,m_bMenuOn(FALSE)
{

}

CMenuBtn::~CMenuBtn()
{

}

BEGIN_MESSAGE_MAP(CMenuBtn, CBaseBtn)
 ON_WM_MOUSEMOVE()
 ON_WM_LBUTTONDOWN()
 ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)       
 ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)
END_MESSAGE_MAP()

void CMenuBtn::OnMouseMove(UINT nFlags, CPoint point) 
{  
 if (!m_bTracking)  
 {   
  TRACKMOUSEEVENT tme;  
  tme.cbSize = sizeof(tme);  
  tme.hwndTrack = m_hWnd;  
  tme.dwFlags = TME_LEAVE|TME_HOVER;  
  tme.dwHoverTime = 1;  
  m_bTracking = _TrackMouseEvent(&tme);  
 }  

 CButton::OnMouseMove(nFlags, point);
}

void CMenuBtn::OnLButtonDown(UINT nFlags, CPoint point) 
{
 if(m_nCtrlState != CTRL_SELECTED)
 {
  m_nCtrlState = CTRL_SELECTED;
  m_bMenuOn = TRUE;
  Invalidate();
 }

 CButton::OnLButtonDown(nFlags, point);
}

LRESULT CMenuBtn::OnMouseLeave(WPARAM     wParam,LPARAM   lParam)       
{   
 if(m_bMenuOn)
 {
  m_nCtrlState = CTRL_SELECTED;
  Invalidate();
 }
 else
 {
  m_nCtrlState = CTRL_NOFOCUS;
  Invalidate();
 }

 m_bTracking = FALSE; 
 return 0;       
}       

LRESULT CMenuBtn::OnMouseHover(WPARAM wParam,LPARAM lParam)
{
 if (m_nCtrlState != CTRL_FOCUS)
 {
  m_nCtrlState = CTRL_FOCUS;
  Invalidate();
 }

 m_bTracking = FALSE;
 return 0;
}

void CMenuBtn::SetMenuOn(BOOL bMenuOn)
{
 m_bMenuOn = bMenuOn;
 Invalidate();
}

第三类按钮（CStaticBtn.h）

[cpp] view plain copy print ?

#ifndef__STATICBTN_H__
#define__STATICBTN_H__
#include"BaseBtn.h"
classCStaticBtn:publicCBaseBtn
{
public:
CStaticBtn();
~CStaticBtn();
public:
virtualvoidInit(UINTuImageID);
virtualvoidDrawItem(LPDRAWITEMSTRUCTlpDrawItemStruct);
};
#endif

#ifndef __STATICBTN_H__
#define __STATICBTN_H__

#include "BaseBtn.h"

class CStaticBtn : public CBaseBtn
{
public:
 CStaticBtn();
 ~CStaticBtn();

public:
 virtual void Init(UINT uImageID);
 virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
};


#endif

第三类按钮（CStaticBtn.cpp）

[cpp] view plain copy print ?

#include"stdafx.h"
#include"StaticBtn.h"
#include"Public.h"
CStaticBtn::CStaticBtn()
{
}
CStaticBtn::~CStaticBtn()
{
}
voidCStaticBtn::Init(UINTuImageID)
{
SetButtonStyle(BS_OWNERDRAW);
LoadPicture(m_Image,uImageID);
m_nSrcWidth=m_Image.GetWidth();
m_nSrcHeight=m_Image.GetHeight();
SetWindowPos(NULL,0,0,m_nSrcWidth,m_nSrcHeight,SWP_NOMOVE|SWP_NOACTIVATE);
}
voidCStaticBtn::DrawItem(LPDRAWITEMSTRUCTlpDrawItemStruct)
{
if(m_Image.IsNull())
return;
CRectrcBtutton;
GetClientRect(rcBtutton);
CDC*pDC=CDC::FromHandle(lpDrawItemStruct->hDC);
CRectrcSrc=CRect(0,0,m_nSrcWidth,m_nSrcHeight);
m_Image.Draw(pDC->m_hDC,rcBtutton,rcSrc);
}

#include "stdafx.h"
#include "StaticBtn.h"
#include "Public.h"

CStaticBtn::CStaticBtn()
{

}

CStaticBtn::~CStaticBtn()
{

}

void CStaticBtn::Init(UINT uImageID)
{
 SetButtonStyle(BS_OWNERDRAW);

 LoadPicture(m_Image, uImageID);
 m_nSrcWidth = m_Image.GetWidth();
 m_nSrcHeight = m_Image.GetHeight();

 SetWindowPos(NULL, 0, 0, m_nSrcWidth, m_nSrcHeight, SWP_NOMOVE|SWP_NOACTIVATE);
}

void CStaticBtn::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
 if (m_Image.IsNull())
  return;

 CRect rcBtutton;
 GetClientRect(rcBtutton);

 CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);

 CRect rcSrc = CRect(0, 0, m_nSrcWidth, m_nSrcHeight);
 m_Image.Draw(pDC->m_hDC, rcBtutton, rcSrc);
}

使用方法：

CNoraml m_NorBtn;

m_NorBtn.Init(UNIT);

因为NormalBtn和MenuBtn需要相应鼠标事件，有图片切换，为了更好的图片切换效果使用双缓冲绘图。双缓冲绘图需要先创建一张画布（CBaseBtn::DrawItem（）函数）

[cpp] view plain copy print ?

CBitmapmemBitmap;
memBitmap.CreateCompatibleBitmap(pDC,buttonRect.Width(),buttonRect.Height());
dcMem.SelectObject(memBitmap);
dcMem.FillSolidRect(buttonRect,RGB(255,0,255));//设置画布颜色

 CBitmap memBitmap;
 memBitmap.CreateCompatibleBitmap(pDC, buttonRect.Width(), buttonRect.Height());
 dcMem.SelectObject(memBitmap);
 dcMem.FillSolidRect(buttonRect, RGB(255,0,255)); //设置画布颜色

所以虽然用了虽然PNG图片有透明属性，但是画布无法设置透明属性，最后的结果是虽然PNG图片背景透明了，因为画布的存在，无法做出一个不规程的按钮出来。
而StaticBtn使用的是单缓冲，没有画布的存在，利用PNG图片的透明属性，可以做出一个不规则的按钮。但是单缓冲绘图对于图片的切换效果不好，所以只用来做一个不响应鼠标消息的静态按钮。未来有空我将会写《MFC 之 CButton 控件重绘（GDI+篇）》利用GDI+绘图来解决这个问题。

完整的项目工程下载地址：http://download.csdn.net/detail/yuzhenxiong0823/7167827

[cpp] view plain copy print ?

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MFC 之 CButton 控件重绘（GDI篇）

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